Effect of grassland management on soil carbon sequestration in Rondonia and Mato Grosso states, Brazil

Autor(es)

Maia, Stoecio M. F. ^[1] ; Ogle, Stephen M. ^[2] ; Cerri, Carlos E. P. ^[1] ; Cerri, Carlos C. ^[3]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo ESALQ USP, Dept Ciencia Solo, Escola Super Agr Luiz Queiroz, BR-13418900 Piracicaba, SP - Brazil

^[2] Colorado State Univ, Nat Resource Ecol Lab, Ft Collins, CO 80523 - USA

^[3] Univ Sao Paulo CENA USP, Ctr Energia Nucl Agr, BR-13416000 Piracicaba, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Geoderma; v. 149, n. 1-2, p. 84-91, FEB 15 2009.
• Citações Web of Science: 95

Resumo

Grassland management affects soil organic carbon (SOC) content and a variety of management options have been proposed to sequester carbon. However, studies conducted in Brazilian pastures have shown divergent responses for the SOC depending on management practices. Our objective was to evaluate the effects of management on SOC stocks in grasslands of the Brazilian states of Rondonia and Mato Grosso, and to derive region-specific factors for soil C stock change associated with different management conditions. Compared to SOC stocks in native vegetation, degraded grassland management decreased SOC by a factor of 0.91 +/- 0.14, nominal grassland management reduced SOC stock for Oxisols by a relatively small factor of 0.99 +/- 0.08, whereas, SOC storage increased by a factor of 1.24 +/- 0.07 with nominal management for other soil types. Improved grassland management on Oxisols increased SOC storage by 1.19 +/- 0.07, relative to native stocks, but there were insufficient data to evaluate the impact of improved grassland management for other soil types. Using these results, we also evaluated the potential for grassland management to sequester or emit C to the atmosphere, and found that degraded grassland management decreased stocks by about 0.27-0.28 Mg C ha(-1) yr(-1); nominal management on Oxisols decreased C at a rate of 0.03 Mg C ha(-1) yr(-1), while nominal management on others soil types and improved management on Oxisols increased stocks by 0.72 Mg C ha(-1) yr(-1) and 0.61 Mg C ha(-1) yr(-1), respectively. Therefore, when well managed or improved, grasslands in Rondonia and Mato Grosso states have the potential to sequester C. (c) 2008 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 05/59012-1 - Impacto ambiental da expansão da agricultura no sudoeste da Amazônia
• Beneficiário: Carlos Clemente Cerri
• Linha de fomento: Auxílio à Pesquisa - Temático